Local Model of Non-Ideal Type-II Superconductors I. : Critical Current Density

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概要

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• The local model of non-ideal type-II superconductors with pinning force is presented by modifying a general solution of the London equation. The local field around the core is deformed by the transport current. This deformation satisfies the London equation and is represented in a form so that the nature of the pinning force is included. The critical current density J_c is given by polynomial J_c=Σ__<m=1>A_<2m-1>J_<t(2m-1>), and the first term J_<t1> agrees with that in the Coffey's model (Phys. Rev. 166 (1968) 447) which explains the experimental results on Nb_2Sn and heat-treated Nb-22at.%Ti. Inclusion of terms with m<1 can explain a variety of J_c-H plateau curves, peak effect, etc. The amplitude A_<2m-1> and mode m of the deformation vary with the kinds of lattice defects to pin fluxoids, and these are required to be independent of an applied magnetic field, but dependent on the temperature.

• 社団法人応用物理学会の論文
• 1972-02-05

著者

• Matsunaga Sakuro

  Division Of Physics Japan Atomic Energy Research Institute

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• Local Model of Non-Ideal Type-II Superconductors I. : Critical Current Density
• Local Model of Non-Ideal Type-II Superconductors II. : Flow Conductivity
• Temperature Dependence of Critical Current in Nb_3Sn Ribbon

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